Thermodynamic behavior of Na2O-B2O3 melt

Joo Hyun Park, Dong Joon Min

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The activity of Na2O in a Na2O-B2O3 melt was measured at 1373 K by a chemical equilibration technique to understand the thermodynamic behavior of this slag system. Also, the activity coefficient of Na in Ag was preliminarily measured as fundamental thermodynamic data, to estimate the activity of Na2O in the slag. Sodium in the silver melt, within the present concentration range, exhibits the Henrian behavior, and the Henrian activity coefficient of Na in Ag (γNa0) is estimated to be 37.5 at 1373 K, indicating a positive deviation from ideality. The activity of Na2O in the slag varies from 1.86 × 10-6 to 4.99 × 10-4 when its content is increased from 11.0 to 64.9 mol pct; this indicates a significant negative deviation from ideality. The excess stability does not exhibit any pronounced peak, despite being drastically changed at specific slag compositions. Comparing the molar Gibbs free energy of mixing in various binary slags, Na2O was considered to be more basic than BaO (CaO) was, followed next by MgO; also, P2O5 would be significantly more acidic than SiO2 would be, followed next by B2O3. Comparing the heats of formation of solid compounds in binary slags, the larger the differences in the electronegativity values between slag components, the more the relative ionic characters of the melts seemed to be.

Original languageEnglish
Article number52
Pages (from-to)297-303
Number of pages7
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume32
Issue number2
DOIs
Publication statusPublished - 2001 Jan 1

Fingerprint

slags
Slags
Thermodynamics
thermodynamics
phosphorus pentoxide
Activity coefficients
deviation
Electronegativity
heat of formation
Gibbs free energy
coefficients
sodium oxide
boron oxide
Silver
Sodium
silver
sodium
estimates
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

@article{386849f2745343f8aeff63e516a27485,
title = "Thermodynamic behavior of Na2O-B2O3 melt",
abstract = "The activity of Na2O in a Na2O-B2O3 melt was measured at 1373 K by a chemical equilibration technique to understand the thermodynamic behavior of this slag system. Also, the activity coefficient of Na in Ag was preliminarily measured as fundamental thermodynamic data, to estimate the activity of Na2O in the slag. Sodium in the silver melt, within the present concentration range, exhibits the Henrian behavior, and the Henrian activity coefficient of Na in Ag (γNa0) is estimated to be 37.5 at 1373 K, indicating a positive deviation from ideality. The activity of Na2O in the slag varies from 1.86 × 10-6 to 4.99 × 10-4 when its content is increased from 11.0 to 64.9 mol pct; this indicates a significant negative deviation from ideality. The excess stability does not exhibit any pronounced peak, despite being drastically changed at specific slag compositions. Comparing the molar Gibbs free energy of mixing in various binary slags, Na2O was considered to be more basic than BaO (CaO) was, followed next by MgO; also, P2O5 would be significantly more acidic than SiO2 would be, followed next by B2O3. Comparing the heats of formation of solid compounds in binary slags, the larger the differences in the electronegativity values between slag components, the more the relative ionic characters of the melts seemed to be.",
author = "Park, {Joo Hyun} and Min, {Dong Joon}",
year = "2001",
month = "1",
day = "1",
doi = "10.1007/s11663-001-0052-4",
language = "English",
volume = "32",
pages = "297--303",
journal = "Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science",
issn = "1073-5615",
number = "2",

}

Thermodynamic behavior of Na2O-B2O3 melt. / Park, Joo Hyun; Min, Dong Joon.

In: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Vol. 32, No. 2, 52, 01.01.2001, p. 297-303.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Thermodynamic behavior of Na2O-B2O3 melt

AU - Park, Joo Hyun

AU - Min, Dong Joon

PY - 2001/1/1

Y1 - 2001/1/1

N2 - The activity of Na2O in a Na2O-B2O3 melt was measured at 1373 K by a chemical equilibration technique to understand the thermodynamic behavior of this slag system. Also, the activity coefficient of Na in Ag was preliminarily measured as fundamental thermodynamic data, to estimate the activity of Na2O in the slag. Sodium in the silver melt, within the present concentration range, exhibits the Henrian behavior, and the Henrian activity coefficient of Na in Ag (γNa0) is estimated to be 37.5 at 1373 K, indicating a positive deviation from ideality. The activity of Na2O in the slag varies from 1.86 × 10-6 to 4.99 × 10-4 when its content is increased from 11.0 to 64.9 mol pct; this indicates a significant negative deviation from ideality. The excess stability does not exhibit any pronounced peak, despite being drastically changed at specific slag compositions. Comparing the molar Gibbs free energy of mixing in various binary slags, Na2O was considered to be more basic than BaO (CaO) was, followed next by MgO; also, P2O5 would be significantly more acidic than SiO2 would be, followed next by B2O3. Comparing the heats of formation of solid compounds in binary slags, the larger the differences in the electronegativity values between slag components, the more the relative ionic characters of the melts seemed to be.

AB - The activity of Na2O in a Na2O-B2O3 melt was measured at 1373 K by a chemical equilibration technique to understand the thermodynamic behavior of this slag system. Also, the activity coefficient of Na in Ag was preliminarily measured as fundamental thermodynamic data, to estimate the activity of Na2O in the slag. Sodium in the silver melt, within the present concentration range, exhibits the Henrian behavior, and the Henrian activity coefficient of Na in Ag (γNa0) is estimated to be 37.5 at 1373 K, indicating a positive deviation from ideality. The activity of Na2O in the slag varies from 1.86 × 10-6 to 4.99 × 10-4 when its content is increased from 11.0 to 64.9 mol pct; this indicates a significant negative deviation from ideality. The excess stability does not exhibit any pronounced peak, despite being drastically changed at specific slag compositions. Comparing the molar Gibbs free energy of mixing in various binary slags, Na2O was considered to be more basic than BaO (CaO) was, followed next by MgO; also, P2O5 would be significantly more acidic than SiO2 would be, followed next by B2O3. Comparing the heats of formation of solid compounds in binary slags, the larger the differences in the electronegativity values between slag components, the more the relative ionic characters of the melts seemed to be.

UR - http://www.scopus.com/inward/record.url?scp=85011878091&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85011878091&partnerID=8YFLogxK

U2 - 10.1007/s11663-001-0052-4

DO - 10.1007/s11663-001-0052-4

M3 - Article

AN - SCOPUS:85011878091

VL - 32

SP - 297

EP - 303

JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

SN - 1073-5615

IS - 2

M1 - 52

ER -